BD92111F Datasheet, PDF (14/28 Pages) Rohm – PFC Direct current resonance type White LED Driver for Large LCD

BD92111F
PIN.12 SS
This is soft start time and SDON time set up pin. Constant current 2.0µA(Typ) is charged to external capacitor
(0.01µF to 0.1µF). When soft start is under operation (SS pin voltage is less than 3.0V), timer latch protection
circuit by CP charge will not operate.
2uA
ss
Css
3.0V
POWER ON
Finish Soft
Start
Where:
CSS is the capacitance of SS pin
Figure. 22 SS Block Diagram
T_SSEND
C_SS

V_SSEND
I_SS

C_SS  3.0
2.0 10^6
 1.5 10⁶  C_SS
[sec]
PIN.13 FAIL
This is fail signal output pin of IC. At normal situation, it outputs GND Level and it becomes Open after timer latch
in case any abnormality is detected. The pull up voltage during Open must be set less than rated voltage 5.5V of
FAIL pin. Please connect about 0.1uF capacitor for noise reduction to FAIL pin.
Condition
FAILOutput
Normal operation
GND Level
FAIL
Abnormal operation
Open
Figure. 23 FAIL Block Diagram
PIN.14 COMPSD
This is input pin for shut down detection comparator. When SDON pin voltage is over 2.0V(Typ) and COMPSD is
4.0V(Typ), it will latch after the next clock.
PIN.15 COMP
This is input pin for over voltage protection comparator. The detection voltage of comparator is 4.0V(Typ) and will
start charging to CP pin after over voltage detection. After CP is charged, it will shut down by timer latch.
PIN.16 PGND
This is Power GND pin for output pin N1, N2 at driver part. Please make it independent from GND (Pin 3) pin on
inverter PCB. This pin is not connected to GND pin in IC inside.
PIN.17 N2
This is gate drive output pin for Low Side external Nch FET. Normally please connect it to FET gate through about
10Ω resistor. It is for noise reduction. Gate has to be pull-down to source by resistor of 1kΩ to 10kΩ.
PIN.18 N1
This is gate drive output pin for Low Side external Nch FET. Normally please connect it to FET gate through about
10Ω resistor. It is for noise reduction. Gate has to be pull-down to source by resistor of 1kΩ to 10kΩ.
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TSZ02201-0F5F0C100090-1-2
31.Jan.2016 Rev.001